Finding the Fourth Proportional to 2,678.49, 4,019.55 and 947.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,678.49 : 4,019.55 = 947.12 : x
2. Step 2: Convert to fraction form
   2,678.49/4,019.55 = 947.12/x
3. Step 3: Cross multiply
   2,678.49x = 4,019.55 × 947.12
4. Step 4: Simplify right side
   2,678.49x = 3,806,996.20
5. Step 5: Solve for x
   x = 3,806,996.20/2,678.49
6. Step 6: Final answer
   x = 1,421.32